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Find the coordinates of the midpoint of HX with endpoints H(-1,3) and x(7,-1) show your work

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\bf \textit{middle point of 2 points }\\ \quad \\ \begin{array}{lllll} &x_1&y_1&x_2&y_2\\ % (a,b) H&({{ -1}}\quad ,&{{ 3}})\quad % (c,d) X&({{ 7}}\quad ,&{{ -1}}) \end{array}\qquad % coordinates of midpoint \left(\cfrac{{{ x_2}} + {{ x_1}}}{2}\quad ,\quad \cfrac{{{ y_2}} + {{ y_1}}}{2} \right) \\\\\\ \left(\cfrac{7-1}{2}\quad ,\quad \cfrac{{{ -1}} + {{ 3}}}{2} \right)
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